To determine if a crown is made of solid gold, you can measure its density or look for certain markings or stamps indicating its purity.
Explanation:One way to determine if a crown is made of solid gold is to measure its density. Gold has a density of 19.3 g which is higher than most other metals. To find the density of the crown, you need to measure its mass using a balance and its volume using water displacement. If the density of the crown matches the density of gold, it is likely made of solid gold.
Another way to determine if the crown is made of solid gold is to look for certain markings or stamps. In many countries, solid gold items are required to have a hallmark, which indicates the purity of the gold. This hallmark can usually be found on the inside of the crown. It is important to note that these methods provide a good indication but cannot guarantee with absolute certainty if a crown is made of solid gold.
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1) If the average atomic mass of hydrogen in nature is 1.0079, what does that tell you about the percent
composition of H-1 and H-2 in nature?
Answer:
The percent composition of Protium( H¹) in nature is 99.21%.
The percent composition of Deuterium (H² )in nature is 0.79%.
Explanation:
Atomic mass of protium is 1.
Atomic mass of deuterium is 2.
These are two isotopes of hydrogen that make the total abundance of hydrogen in nature while third isotope tritium is radio active and unstable its abundance is 0%.
First of all we will set the fraction for both isotopes H¹ and H²
X for the isotopes having mass 2 amu.
1-x for isotopes having mass 1 amu.
The average atomic mass of hydrogen is 1.0079.
we will use the following equation,
2x + 1 (1-x) = 1.0079
2x + 1 - 1x = 1.0079
2x- 1x = 1.0079 - 1
1x = 0.0079
x= 0.0079/1
x= 0.0079
Percent abundance of H².
0.007 × 100 = 0.79 %
0.79% is abundance of H² because we solve the fraction x.
now we will calculate the abundance of H¹.
(1-x)
1-0.0079 =0.9921
Percent abundance of H¹.
0.9921 × 100= 99.21 %
99.21% for H¹.
The average atomic mass of hydrogen is 1.0079, which suggests that the most common isotope is H-1, but there is also a smaller amount of H-2 in nature. The specific percent composition would require more information to determine.
Explanation:The average atomic mass of an element is the weighted average of the atomic masses of its naturally occurring isotopes. The fact that the average atomic mass of hydrogen is 1.0079 indicates that the most abundant isotope in nature is H-1 (hydrogen-1 or protium) which has an atomic mass close to 1. However, H-2 (hydrogen-2 or deuterium) is also present in nature, but in smaller amounts, as its atomic mass is close to 2. The slightly higher than 1 average atomic mass takes into account these two isotopes' presence and their relative abundances.
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Taro stated that when someone hits a golf ball with a club, the amount of energy the ball has changes, the amount of energy that the club has changes, and the total energy of the system that includes the ball and the club increases. Which best explains Taro’s error?
Answer:
The error in the statement of there is the increase in amount of energy is talking about.
Explanation:
In the given experiment two ball that is present has potential energy and is static in a place, were the club that hates the ball has a certain amount of kinetic energy present in it.
After hitting the ball that kinetic energy transferred to the ball while the club becomes constant. Hence there is only a transfer of energy that is taken place the overall energy of the system remains same, So no increase or decrease is observed in the system .
A pumpkin has a volume of 10 cm and a mass of 8 g. what is the density of the pumpkin
Answer: 0.8g/cm^3
Explanation:
In seeing your problem, I see an issue with your units for centimeter. The volume is in the third dimension, so we use cm^3 every single time for the volume. That way, we can arrive to the correct density (in g/cm^3)
Density = mass/volume and so
Density = 8g/10cm^3
= 0.8g/cm^3
The density of the pumpkin is calculated using the formula density (h₀) = mass (m) / volume (V) and with the values given (8 g for mass and 10 cm³ for volume) the density is 0.8 g/cm³.
To find the density of a pumpkin with a volume of 10 cm³ and a mass of 8 grams, you use the formula density (h₀) = mass (m) divided by volume (V). Since the mass of the pumpkin is given as 8 g and the volume as 10 cm³, you can calculate the density directly.
The formula looks like this : h₀ = m / V
So, plugging in the values :
h₀ = 8 g / 10 cm³
h₀₀ = 0.8 g/cm³
The density of the pumpkin is therefore 0.8 g/cm³.
You are measuring the mass of different chemicals to get ready to conduct an experiment.
Which one would be a example of the correct International System of Measurement units to use for measuring mass?
A) ounces
B) grams
C) pounds
D) tablespoons
Answer:
Explanation:
B
Answer: B) grams
Explanation:
Mass is the amount of matter contained in a substance.
It can be measured in units of kilograms (kg), grams (g), milli grams (mg) , pounds etc.These units are interconvertible.
International System of Measurement (S.I.) is the most commonly used system. As we know that there are seven fundamental SI units which are used to find derived units . These are as follows:
1) Mass - Kilogram
2) Length - meter
3) Time - Seconds
4) Electric Current - Ampere
5) Amount of substance - Moles
6) Intensity of light - Candela
7) Temperature - Kelvin
Thus International System of Measurement units used for measuring mass is grams.
13. How many valence electrons does an atom
with 5 electrons, 5 neutrons, and 5 protons
have in its ground state?
A. 5
B.
4.
C.
D.
3
2
Answer:
The answer to your question is: 3
Explanation:
If an atom has 5 electrons, 5 neutrons and 5 protons, it means that the element is Boron. Boron is situated in the third group A, that means that is has 3 elements in its outermost shell.
Also, if we do the electronic configuration:
1s² 2s²2p¹
If we count the number of electron in the second level of energy, the result will be: 2 in s and 1 in p = 3. Those are the valence electrons.
This word means that one event happens at the same time as another event
Answer:
Meanwhile
Explanation:
Think of a comic book, or a superhero show, you usually see the protagonist, or the hero, doing something like saving an innocent pedestrian, or helping a little old lady across a street, then the screen will flash and say 'meanwhile' which means while this was happening, this was also happening.
An example could be in The Wizard of Oz, when Dorothy is walking with her friends through The Haunted Forest, you see the Wicked Witch of the East, peering through her crystal ball, unto Dorothy. To summarize what was happening you could say,
'Meanwhile, as Dorothy and her friends walked through The Haunted Forest, The Wicked Witch watched their stroll.'
Really hopes this helps!
which of the following do not have molecules in motion A. solids B. they all have molecules in motion C. liquids D. gases
A car is traveling at a speed of 95 mi/h. If there are 0.62137 miles (mi) in a kilometer,
what is the speed of the car in m/s?
Answer:
42 m/s
Explanation:
To we convert units for speed we can use dimensional analysis. First thing we do is seperate the measurement into a fraction. After this we can multiply by 1km over 0.62137 miles. We do this so that the miles cancel out.
[tex]\frac{95mi}{h}[/tex] × [tex]\frac{1km}{0.62137mi}[/tex] = [tex]\frac{95km}{0.62137h}[/tex]
After this we can use a conversion factor and divide by 3.6.
[tex]\frac{95km}{0.62137h}[/tex] ÷ 3.6 = 42 m/s
A pharmacist measures the mass of a powdered drug. The mass is 506 mg . What is the mass in grams? Write your answer as a decimal.
Answer:
0.506 g
Explanation:
we know that one miligram is equal to 0.001 g or we can say that one gram contain thousand miligram. so,
if the mass of drug is 506 mg then to convert it into gram we have to divide 506 mg into 1000.
After fertilization, female cones become very:
sticky
light
O hard
Answer: Sticky and light
After fertilization, female cones become hard.
After fertilization, female cones become hard. This process happens in the life cycle of gymnosperms, where female cones are located in the upper branches of the trees. These cones are fertilized by pollen, which is delivered by the wind from the male cones. The question relates to how these female cones change after they have been successfully fertilized. Following fertilization, the cones, which contain seeds, mature and their scales become woody or hard to protect the developing seeds inside. This hardening process is crucial for the protection and eventual dispersal of the seeds. It contributes to the reproductive success of gymnosperm plants by ensuring that seeds are effectively protected until they are ready for dispersal.
Define the term relative molecular mass
Answer:
Explanation:
The relative molecular mass of a compound the ratio of the average mass of one of its molecule compared to one-twelfth of the mass of an atom of carbon-12. It is usually expressed as grams per mole of a compound. Relative molecular mass is derieved by the addition of its component atomic masses.
Sodium, an explosive soft metal, and chlorine, a greenish poisonous gas, form an ionic bond between them to create sodium chloride, or table salt. This statement demonstrates that ionic bonds create substances that have ________ properties than the elements that created them.
A. similar B. different C. more D. less
Answer:
B.) different
Explanation:
Answer:
Option B different
Explanation:
As stated in the question, both sodium and chlorine are dangerous elements which can harm human. However, when they are joined by ionic bond to form sodium chloride. In generic term, sodium chloride is the table salt which is the main mineral constituent of the sea water and it is also a common mineral taken by human. This shows that the ionic bond can create substances which possesses different properties than the elements that created them.
Which factor affects kinetic energy but not potential energy?
Mass
Velocity
Elasticity
Height
Answer:
Mass
Explanation:
The scientific name of a grizzly bear is Ursus arctos. Which part of the name is the genus? Which part of the name is the species?
Answer:
Ursus: genus
Arctos: Species
Explanation:
If you think of the way the chart flows from the most broad to the most specific: kingdom, phylum/division, class, order, family, genus, species, you see that genus name comes first then the species name.
How many hydrogen Adams are there in 3.14 moles of H2O
Answer:
3.783×10²⁴
Explanation:
We know that one mole of water contain two moles of hydrogen atom and one mole of oxygen atom. shown in following equation:
2H₂ + O₂ → 2H₂O
And
1 mole of hydrogen = 6.022×10²³ atoms of hydrogen
The number 6.022×10²³ is called Avogadro number and it is the number of atoms in one mole of substance. While we have to find the hydrogen atoms in 3.14 moles of water
So the factor 3.14 given in the question contain
3.14×2×6.022×10²³ number of hydrogen atoms which is equal to the 3.783×10²⁴.
Answer:
1.89×10^24 atoms
Explanation:
I mole of hydrogen molecule contains 6.02×10^23 atoms. This is known as the Avogadro's number. The Avogadro's number gives the number of elementary entities contained in one mole of a substance.
One mole of a substance is the amount of that substance that contains the same number of elementary entities as 12g of C-12
Hence 3.14 moles of hydrogen will contain 3.14 ×6.02×10^23= 1.89×10^24 atoms
Jeannie dropped a solid object into a beaker of water and observed it for five minutes. Based on her observations, she determined that only a physical change occurred.
Which of the following observations would indicate that only a physical change occurred after she added the object?
A.
The object broke apart and seemed to disappear when dropped into the glass of water.
B.
The object sank to the bottom when dropped into the glass of water.
C.
Bubbles formed around the object as it sank to the bottom of the water and did not resurface.
D.
The object floated on the top of the water when when dropped into the glass.
Answer:
A. The object broke apart and seemed to disappear when dropped into the glass of water.
Explanation:
In a physical change, the physical properties of the matter usually the state of the matter is altered. Most physical changes are usually reversible and does not lead to the production of new substances.
When the solid object was dropped into the water beaker and it dissolves by disappearing the solution, we have experienced a physical change. This is a dissolution reaction. If we heat the solution and water given off, we can recover back the dissolved solid object.
Which of the following is true about nuclear fission?
Question 2 options:
If you add the masses of all the products after fission, they are GREATER than the mass of the reactants.
If you add the masses of all the products after fission, they are the SAME as the mass of the reactants.
If you add the masses of all the products after fission, they are LESS than the mass of the reactants.
The mass of the products is 100 times greater than the original nucleus.
Answer:
If you add the masses of all the products after fission, they are LESS than the mass of the reactants.
Explanation:
A nuclear fission reaction is a radioactive reaction which in which a heavy nucleus spontaneously disintegrates into 2 lighter nuclei and some neutrons with a release of large amount of energy.
When nuclear fission occurs, a mass deficit between the decaying nuclei and the product occurs. It is this mass that actually yields the energy that is produced as a by product of the reaction.
Which solution below most likely shows a vivid color?
A.) potassium chloride
B.) nickel chloride
C.) hydrogen chloride
D.) lithium chloride
Lithium chloride solution most likely shows a vivid colour.
Answer: Option D
Explanation:
Flame test, an analytical strategy in chemistry to find certain elements, like metal ions, on the basis of characteristic emission spectrum of each element.
Because each element has a well-defined spectrum of linear emission, scientists can recognise it by the colour of the flame they produce.
For example, lithium and strontium red flame, nickel chloride appears as a brown or green solid, the potassium salt in the flame gives a characteristic purple colour, and hydrogen chloride as acid, a colourless gas. Colour's dense in the order as blue > red > green > yellow.
65.39
Atomic # =
Atomic Mass =
# of Protons =
# of Neutrons =
# of Electrons =
Answer:
The answer to your question is below
Explanation:
Atomic mass = 65.39 g
Searching this number in the periodic table we find that the element is Zinc.
Then:
# of Protons = 30
# of neutrons = atomic mass - # of protons
= 65.39 - 30
= 35.39
# of electrons = # of protons = 30
When solid magnesium burns, it reacts with oxygen in the air to form a powder called magnesium oxide. A chemist performed this reaction in a lab and found that the mass of the magnesium oxide was greater than the mass of the magnesium. What is the reason behind this increase in mass?
A. The increase in the mass of the magnesium oxide was due to oxygen atoms in the air.
B. The increase in the mass of the magnesium oxide happened because oxygen is heavier than magnesium.
C. The increase in the mass of the magnesium oxide happened because magnesium is heavier than oxygen.
D. The increase in the mass of the magnesium oxide was due to magnesium atoms in the air.
Answer:
A. The increase in the mass of the magnesium oxide was due to oxygen atoms in the air.
Explanation:
Burning occurs in the presence of oxygen. A chemical combination occurs between Mg and O in that the atom of magnesium attracts one another.
Mg + O₂ → MgO
Starting with the magnesium, on reacting with oxygen a new compound forms. This is why there is mass increase in the MgO compared to the starting material.
Answer: A. The increase in the mass of the magnesium oxide was due to oxygen atoms in the air.
Explanation:
According to the law of conservation of mass, mass can neither be created nor be destroyed. Thus the mass of products has to be equal to the mass of reactants. The number of atoms of each element has to be same on reactant and product side. Thus chemical equations are balanced.
The balanced chemical equation for burning of magnesium in air is:
[tex]Mg(s)+O_2(g)\rightarrow 2MgO(s)[/tex]
When magnesium combines with oxygen, the mass of magnesium oxide formed will be same as the sum of masses of magnesium and oxygen.
Thus the increase in the mass of the magnesium oxide was due to oxygen atoms in the air.
The element _____ is not one of the four most common in your body. hydrogen nitrogen oxygen sodium
Answer:
Nitrogen
Explanation:
Answer:
Explanation:
#9 Sodium (Na) - 0.15% - Sodium is an important electrolyte. Like potassium, it is used for nerve signaling. Sodium is one of the electrolytes that helps regulate the amount of water in the body.
How do simple machines make work easier?
They increase the distance of applied forces.
They change the strangth or direction of a force.
o They add energy to the work.
O
They reduce the speed of work.
Answer:
They increases the distance of applied force(torque)as well as they change the strenght or direction of a force(90 angle work).
Explanation:
Answer:
W=f× d
Increase the distance of applied forces
Explanation:
Increasing the distance between applied forces increases the work done on the machine which makes work easier..they change the direction and strength of the force.
Consider the following precipitation reaction: 2Na3PO4(aq)+3CuCl2(aq)→ Cu3(PO4)2(s)+6NaCl(aq)
What volume of 0.184 M Na3PO4 solution is necessary to completely react with 94.6 mL of 0.108 M CuCl2?
Answer:
V= 37.0 mL
Explanation:
First find the moles of the known substance (CuCl2)
n= cv
where
n is moles
c is concentration
v is volume ( in litres)
n= 0.108 × 0.0946
n=0.0102168
Using the mole ratio in the balanced reaction, we can find the moles of Na3PO4
n (Na3PO4)= n (CuCl2) × 2/3
=0.0102168 × 2/3
=0.0068112
Now we have all the necessary values to calculate the volume
v=n/c
v= 0.0068112/0.184
v= 0.0370173913 L
v= 37.0 mL
37 ml volume of 0.184 M Na₃PO₄ solution is necessary to completely react with 94.6 mL of 0.108 M CuCl₂ solution.
What is molarity?The molarity is the way to express the concentration of the solution. The molarity of any solution can be calculated by dividing the number of mos of solute by the volume of the solution in liters. The unit of the molarity of the solution is mol/L or represented by M.
Given the chemical equation of precipitation reaction:
2Na₃PO₄ (aq) + 3CuCl₂ (aq) → Cu₃(PO₄)₂ (s) + 6NaCl (aq)
Given the volume of 0.108 M CuCl₂ solution = 94.6 ml = 0.946 L
The number of moles of CuCl₂ = M ×V = 0.108 × 0.846 = 0.01022 mol
If 3 moles of CuCl₂ completely react with Na₃PO₄ = 2
Then 0.01022 moles of CuCl₂ will react with Na₃PO₄ :
= (2/3) × 0.01022
= 0.00681 mol
The volume of 0.184 M of Na₃PO₄ required = 0.00681 /0.184 = 37 ml
Therefore, 37 ml of Na₃PO₄ solution is required to completely react with 94.6mL of 0.108 M CuCl₂.
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4
Nitric acid can be made using ammonia.
a) The first stage in the manufacture of nitric acid is to oxidise ammonia, NH,,
to nitrogen(II) oxide, NO. Balance the equation for the reaction.
........ NH, + ........ O, → ......... NO + ........ H,O
Answer:
4NH3 + 5 O2 → 4 NO + 6 H2O
Explanation:
The formula of ammonia is NH3. Oxidise means adding 02. This will result in Nitrogen(II)oxide which is NO, and H20.
On the left side we have 3xH and on the right side we have 2x H. To get the same amount we multiply the left side bij 2 and the right side by 3.
This gives us 2N on the left side, so we multiply NO by 2, to get the same amount of N.
This gives us 5x O at the right side, so to get the same amount we multiply O2 by 5/2 ( we already got 2x O).
This gives us 2NH3 + 5/2 O2 → 2NO + 3H20
We multiply by 2 to get rid of fractions, which will give us:
4NH3 + 5 O2 → 4NO + 6H20
A chemist is doing research to find a better way to process natural gas after it is removed from the ground. Which branch of chemistry best describes this chemist's work?
A: organic chemistry
B: inorganic chemistry
C: biochemistry
D: physical chemistry
Answer:
The branch of chemistry that best describes the chemist´s work is organic chemestry
Explanation:
The chemist wants to improve the process for natural gas, a mix of organic compuond, mainly alcans.
A research to find the better way to process natural gas after it is removed from the ground is a work in organic chemistry.
What is organic chemistry?Organic chemistry deals with organic compounds, their properties, reactions, uses etc. The organic compounds are hydrocarbons and its derivatives contain carbon chains attached with hydrogen in the backbone.
Natural gases are hydrocarbons like methane, propane, butane etc. They comes under organic chemistry. All other compounds other than hydrocarbons and their derivatives are inorganic.
Hence, the research work on natural gas comes in organic chemistry thus, option A is correct.
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how do you convert 250.6 mg to ounces
You often hear people, particularly sports announcers, talk about a "high rate of speed." What do you think they mean? According to the specific definitions of physics terms, what are they really saying?
Answer:
Explanation:
High rate of speed as used by most announcers is actually not correct. Speed is the rate at which distance changes with time. Speed already expresses a rate. What one can deduce is that they probably meant to emphasize more on the how fast a sport is proceeding. Ordinarily saying speed would have been fine.
According to physics, the rate of change of speed is acceleration. Acceleration is the change in velocity with time. A body is said to be accelerating if its velocity is constantly changing.
Final answer:
When sports announcers refer to a "high rate of speed," they typically mean an object is moving quickly. In physics, 'speed' measures how fast an object moves, without direction, and is a scalar quantity. Conversely, 'velocity' includes both speed and direction and is a vector quantity.
Explanation:
When people, especially sports announcers, talk about a "high rate of speed," they are typically referring to an object, such as an athlete or vehicle, moving quickly. However, in physics, speed is a scalar quantity that measures how fast an object is moving without regard to direction, whereas velocity is a vector quantity that includes both the speed and the direction of an object's movement.
Speed can be understood as the rate at which distance is covered over time. To calculate the average speed, you would divide the total distance traveled by the elapsed time. Thus, when someone mentions a "high rate of speed," they likely mean that an object is covering distance rapidly, though they might be unintentionally conflating speed with velocity.
In the context of a race, a higher percentile speed means a faster run. For example, if the 40th percentile of speeds in a race is 7.5 miles per hour, it means that 40% of runners have a speed that is less than or equal to 7.5 miles per hour.
4. The daily output of energy from the sun is 7.80 x 1027 kcal. Convert this energy to
joules (J) & write the answer in scientific notation.
Answer:
The answer to your question is: 3.276 x 10³¹ Joules
Explanation:
Energy from the sun: 7.80 x 10²⁷ kcal
Look for the factor to convert units
Rule of three to convert units
1 cal ---------------------- 4.2 Joules
1000 cal --------------------- x
x = (1000 x 4.2) / 1 = 4200 Joules
1 kcal ---------------- 4200 Joules
7.8 x 10²⁷ kcal ------- x
x = (7.8 x 10²⁷ x 4200) / 1 = 3.276 x 10³¹ Joules
A nugget of gold with a mass of 521 g is added to 50.0mL of water.The water level rises to a volume of 77.0mL. What is the density of the gold?
Answer:
The question to your answer is:
Explanation:
Data
mass = 521 g
Water volume = 50.0 ml
Increase of water = 77 ml
Formula
density = mass / volume
First substract the final volume to the initial volume
Volume of gold = 77 - 50 = 27 ml
Now, use the formula
density = 521 / 27 ml = 19.3 g/ml
The density of the gold nugget is 19.3 g/mL.
To find the density of the gold, we need to calculate the volume of the gold nugget from the water displacement and then divide the mass of the gold by this volume. The volume of the gold nugget can be determined by calculating the difference in the water level before and after the gold was added. This value is 77.0 mL - 50.0 mL = 27.0 mL. Since the density (d) can be calculated using the formula d = mass/volume, we can substitute the given mass of 521 g and the calculated volume of 27.0 mL to find the density.
Using these values gives us: density = 521 g / 27.0 mL = 19.3 g/mL.
Therefore, the density of the gold is 19.3 g/mL, which is consistent with the known density of gold.
Which two elements have properties that are the most similar?
A C and F
B He and Ne
C Al and Si
D N and S
Answer:
The answer to your question is letter b) He and Ne
Explanation:
Elements that have similar properties are placed in the same group in the periodic table.
So
A C and F These elements do not have similar properties because C is in group 4A and F is in group 7A. This is not the right answer.
B He and Ne These elements have similar properties becase they are in the same group (8A).
C Al and Si These elements do not have similar properties because Al is in group 3A and Si is in group 4A. This is not the right answer.
D N and S These elements do not have similar properties because N is in group 5A and S is in group 6A. This is not the right answer.